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建立橡胶和塑料2种熔体在矩形流道中共挤流动的三维非等温有限元模型,采用有限元法数值模拟了PA6/EPDM的共挤流动过程,研究了橡塑共挤的流动规律以及入口体积流量比与复合材料层厚比的关系。结果表明:在共挤过程中,共挤界面会倾于向熔体入口体积流量相对小、熔体黏度低的一侧偏移,同时黏度低的熔体流动速度快;入口体积流量比的减小有利于减小界面偏移和界面波动。将模拟计算得到的层厚比与实验结果进行了对比,结果表明数值模拟与实验基本一致。
A three-dimensional non-isothermal finite element model of co-extrusion flow of rubber and plastic melt in a rectangular flow channel was established. The co-extrusion flow of PA6 / EPDM was numerically simulated by finite element method. Volume flow ratio and the relationship between composite layer thickness ratio. The results show that during the co-extrusion process, the co-extruded interface tends to deviate from the relatively small volume flow at the melt inlet and the melt viscosity at the low side, while the melt flow with low viscosity has a fast flow rate. Small help to reduce the interface offset and interface fluctuations. The calculated layer-thickness ratio is compared with the experimental results. The results show that the numerical simulation and the experiment are basically the same.